00808nam0-22003011i-450-990003182860403321000318286FED01000318286(Aleph)000318286FED0100031828620000920d1961----km-y0itay50------baitaITRiddles in MathematicsA Book of ParadoxesEugene P. Northrop.Reprinted with Revision.HarmondsworthPenguin1961.240 p.18 cmPelican booksA47811300Northrop,Eugene P.ITUNINARICAUNIMARCBK99000318286040332111300 NOR020355SESSESRiddles in Mathematics452459UNINAING01